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05b9f505fb
sockopt-fastopen-key.pkt does not have the non-experimental version, so the Experimental version is converted, FOEXP -> FO. The test sets net.ipv4.tcp_fastopen_key=0-0-0-0 and instead sets another key via setsockopt(TCP_FASTOPEN_KEY). The first listener generates a valid cookie in response to TFO option without cookie, and the second listner creates a TFO socket using the valid cookie. TCP_FASTOPEN_KEY is adjusted to use the common key in default.sh so that we can use TFO_COOKIE and support dualstack. Similarly, TFO_COOKIE_ZERO for the 0-0-0-0 key is defined. Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250927213022.1850048-13-kuniyu@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>